A wind-storage coordination control method and system for power grid frequency disturbance process

Abstract

The present disclosure provides a wind-storage coordination control method and system in a grid frequency disturbance process, including: acquiring grid frequency data in real time, and calculating the difference between the current grid frequency and the power frequency frequency; determining the current frequency disturbance based on the difference According to different frequency disturbance modes, the control strategy based on the reserved pitch angle is adopted, and the influence of the pitch rate on the load characteristics of the unit is considered, and the energy storage device is used to release the electric energy. The scheme makes full use of the advantages of the energy storage device for convenient energy release, no delay in power output, stable and controllable power output, etc., and cooperates with the primary frequency modulation control strategy of the wind turbine itself to achieve the purpose of reducing the impact load and fatigue damage of the shaft system. It is of great significance to optimize the load design of wind turbines, improve the "grid-friendly" characteristics of wind turbines, and ensure the safe and stable operation of wind turbines and power grids.

Description

technical field [0001] The present disclosure belongs to the technical field of wind-storage coordination control, and in particular relates to a wind-storage coordination control method and system in a power grid frequency disturbance process. Background technique [0002] The statements in this section merely provide background information related to the present disclosure and do not necessarily constitute prior art. [0003] The penetration rate of wind power is getting higher and higher, the equivalent inertia of the power system is continuously decreasing, and the frequency of grid disturbances will be higher and higher. The problem of safe and stable operation of wind turbines caused by frequent impact of power grid disturbance on the mechanical structure of wind turbines will become increasingly prominent, and the safe and stable operation of wind turbines will face major challenges. [0004] Since the wind turbine is connected to the traditional power electronic gri...

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Problems solved by technology

[0005] The inventors found that, on the one hand, the electromagnetic torque oscillation of the wind turbine generator excites the drive chain shafting or a certain order mode in the left and right direction of the tower to resonate, which in turn causes a large impact load, which will pose a threat to the structural safety of the wind turbine itself

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